Safety attachment for pneumatic tools.



C. A. NAGLE.

SAFETY ATTACHMENT FOR PNEUMATIC TO0LS.,

APPLICATION FILED MAR. 24, I916.

Patented Mar. 13, 1917;

TED STATES PATENT FFQE. 4

.CHARLES A. NAG-LE,-OF ST. LOUIS, MISSOURI.

sArETY ATTACHMENT FOR PNEUMATIc TooLs. I

- a subject of the King of Great Britain, re-

siding at St. Louis, State of Missouri, have invented certain new anduseful Improvements in Safety Attachments for Pneumatic Tools; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

This invention relates to a safety attachment for pneumatictools, andparticularly to an attachment for pneumatic riveter which is designedfor preventing the pro-' jection of the riveting tool from the casing ofthe pneumatic riveter, in case the head of the tool should slip off arivet during the operation of the'riveter.

Another object of this invention is to provide a safety attachment asspecified which includes a pair of pins which extend through the casingof the riveter and project into an annular groove which is formed in theshank of the riveting tool and also to provide means for holding thepins in their proper positions against accidental withdrawing movement.

With the foregoing and other objects in view this invention consists, insuch novel features of construction, combination and arrangement ofparts as will be hereinafter more fully described illustrated in theaccompanying drawing and claimed.

In describing the invention in detail reference will be had to theaccompanying drawings wherein like characters designate like orcorresponding parts throughout the several views, and in which Figure lis a side elevation of a fragment of a riveter showing the improvedsafety attachment-applied thereto.

Fig. 2 is a longitudinal section through the fragment of the riveter.-

Fig. 3 is a horizontal or cross section on the line 33 of Fig. 1.

Fig. 4 is a detail perspective view of one of the pins used in theconstruction of the riveter showing it connected to its supporting head,and

Fig. 5 is a detail fragmentary view of the means for holding the pins intheir proper place. 7

Referring more particularly to the drawings, 1 designates the casing ofa pneumatic Specification of Letters Patent.

Application filed March 24, 1916. Serial No. 86,443. r

Patented Mar. 13, 19f *7.

riveter, of the Rich type, in which is seated the shank 2 of theriveting tool 3.

The shank 2 is provided with an annular groove 4 formed therein intowhich the ends of pins 5 and 6 extend. The pins 5 and 6 extend throughopenings 7 and 8 which are formed in the casing 1 and they have theirouter ends screw threadably seated in blocks 9 and 10. The blocks 9 and10 are provided with laterally extending flanges 11, against the outersurfaces of which the inturned edges of a pair of semicircular bindingmembers 12 and 13 engage. The binding members 12 and 13 are constructedof sheet metal and have their edges turned inwardly as clearly shown inFig. 2 of the drawings, for engagement with the outer surfaces of theflanges 11 of the blocks 10. The ends of the members 12 and 13 areupturned and provided with openings 14 as clearly shown at 15 in Fig. 5of the drawing. The handles 16 of pivotally mounted locking levers 17project through the openings 14:, as clearlyshown in Fig. 3 of thedrawings. The locking levers 17 are provided with earns 18, which camsare pivotally connected as shown at 18 to the members 12 and 13respectively. The innermost portions of the cams 18 engage the outersurface of the casing 1 of the riveter. The handles 16 are provided withoifset portions 16 intermediate their ends.

When it is desired to securely lock the members 12 and 13 in theirproper position, after the entrance of a riveting tool 3 into the casing1, the device is positioned so that the pins 5 and 6 will be positionedvertically,

, and pressure is applied to the upper mem- 5 and 6 to be movedoutwardly for remov ing a riveting tool 3, the outer ends of the levers16 are moved inwardly, so that the offset portions will be out ofengagement with the upturned ends of the members 12 and 13, at whichtime the springs, hereinafter described, will force the blocks 9 and 10,and consequently the members 12 and 13 outwardly, permitting of theremoval of the riveting tool or anvil 3. The extreme outer ends of thlevers 16 are slightly curved, so as to prevent the levers from passingentirely through the openings 14.

The blocks 9 and 10 are provided with recesses 19 formed therein inwhich are seated contacting spiral springs 20. The springs 20 engage theouter surface of the casing 1 and are provided for forcing the blocks 9and 10 outwardly from the casing and moving the ends of the pins 5 and 6out of the recess t when the binding members 12 and 13 are released.

In the foregoing description and in the drawing the improved safetyattachment has been illustrated and described applied to a pneumaticriveter but it is to be understood that it may be applied to anysuitable type analogous tool wherein a reciprocating member is employed.

In reducing the invention to practice certain minor features ofconstruction, combination and arrangement of parts may necessitatealterations to which the patentee is entitled provided such alterationsare comprehended within the scope of what is claimed.

lVhat is claimed is:-

In a device as set forth, the combination with acasing, and areciprocatory tool having a shank mounted in said casing, said shankbcingprovided with an annular recess, a pluralitv of pins extendingthrough said casing and having their inner ends seated in said recess,means for holding said pins firmly in position and means for movmg saidpins out of said annular recess immediately upon the release of saidfirst named means. 1

2. In a device as set forth, the combination with a casing-and a toolhaving a shank reciprocably mounted within said casing, said shank beingprovided with an annular recess, of a plurality of pins extendingthrough said casing and having their inner ends seated in said recess,blocks positioned exteriorly of said casing, the outer ends .of

said pins being detachably connected to said blocks for holding saidblocks in firm abutting engagement with portions of the outer surface ofsaid casing for holding the inner ends of said pins in said recess, saidblocks being provided with recesses extend: ing inwardly from theirinner faces, springs mounted in said recesses, and adapted for forcingsaid blocks away from said casing Copies of this patent may be obtainedfor five cents each, by addressing the Commissioner of upon release ofsaid first named means and means engaging the outer surfaces of saidface of said casing.

3. In a device as set forth, the combination with a tool casing, areciprocatory tool blocks for holding them in firm abutting engagementwith portions of, the inner surthe blocks in firm abutting engagementwith 7 portions of the outer surface of said casing for holding theinner ends of said pins in said recess, means for moving and holdingsaid semi-circular members into a locking position, said means operablefor moving said semi-circular members out of a locking position withrespect to said blocks.

i. In a device as set forth, the combination with a tool-casing, a'reciprocaaorytool having a shank moimted within said casing, said shankbeing provided with an annular recess, of a pluraiity of pins extendingthrough saidcasing and having their inner ends seated in said annularrecess, blocks being positioned exteriorly of said casing, said pinshaving their outer ends detachably connected to said blocks, a pair ofsubstantially semi-circular members engaging, the

outer surfaces of said blocks for binding the blocks in firm abutting,engagement with portions of the outer surface of saidv casing forholdingthe inner ends of said pins in said recess, means for moving andholding said semi-a rcular members into a locking position, said meansoperable for moving 7 said semi-circular members out of a lockingposition w th respect to said blocks, said blocks provided with recessesextendmg mwardly from their inner faces, a-ndsprings in presence of twowitnesses.

CHARLES A, NAGLE.

lVitnesses:

ZIGMONT STAiNnom, THOS. DALEY.

latents,

Washington, D. G."

In testimony whereof I aifix my signature

